Guide for circular saws



Jan. 12, 1932.

M. L. MATHEWS ET AL GUIDE FOR CIRCULAR SAWS Filed Dec. 19, 1930 Patented Jan; 12, 1932 M RCUS I}; BRIQ'E, QeHeIJQPeWJ QBlDi-i Gri rol m efeee' we imitati n filed December 19, i1930. seria1siv ;*os,558. '7

I This invention relates to a saw guideuand more partieularly to a guide adapted; to be suspended from the frame over a c rcular saw and serve to guide the saw blade WhGIlilt-IS i rotatingl One object of-the invention; is toiprovideaguide which is so'assoolated vvith the-upper 1 portion of the saw blade that vibration ofthe I blade will be prevented, thereby permitting Q: thinnerssaws to be us'ediand also causing lum- ,1

her to be more aecurately cut V 7 Another object of theiinventlon is'toprovide the guidewithsaw blade engaging arms a so mounted that they maybe swung upwardg 1y from an operatlveposltlon .to an-inoperati've position-fwhere'th ey will be out of the way if a large log is beingout.

one position-to another. 1

Another ob'e'ct ofthe invention-is to pro "ide a saw guide which is simple in constr-ue- I tion and easy to'operate. i :1

, "Other objeotsand advantag sof them-- vention Will hereinafter appear, and the 9. novel features thereof will *be' particularly pointed out-in the appended claims.

The invention is illustrated in panying drawings wherein A V Fig. 1 is aside elevation showing the saw I guidein operative'relati'on to a saw blade;-

dotted lines indicating the inoperative posiv-- tion of the guides. I

Fig. 2'is a front elev saw guide;

flhis improved guide is for-use in connedtion with a rotary saw blade 1- and is to be" mounted overthe upper portion of the blade" and permits useoi a saw'blade madeoii thin nergauge steel than'isinow possibleQas: it will very eifectively prevent the blade fronrvii fi g tn eev r 'elywhen in use. At the P e e im g i s .fer the w r po iiens e lew b adeee e ne dbet they d new;

the accom tionof the improved i --Fig. 3 is -a seotionaljview taken along se ully iireveetivib efieheifrthe b ades, a e rme of thin; gauge steel-v Th -fram 2 eith gu del ae e eee h eef 3 to which. heupper nd l o sid hers e olted. or ot er isefir lyvee u edia-nd rom;

h re eheed ris s e e umni 5 engage wi h; t readed ed,- er; tein 6 which? i eeitab y" n c e w e po t enfl o a s w heme beve the blade at. by til iiing the red: he guid may; h rai ed 9r lewered h iu t lt p ee mede e th guide he the ee eye the sa bla e 7 3A. eh fe i es red e de d re eteb y enaged through op enings f rmed in. t e lev r: net i the i e bare and h ld heeeepenr n e b p ns" 0- B tw e iheeide he e. the";

, Shaft i .f rm i ithl eleneitefinafly ex-j i d n sl b thr ugh nd pe-rt'ieneefi i Wh eh .v xte d a ms Whi-e ar ,p v elly mou te er w i m vem ntleng dine lyefthe;

he fibif pins 1,2" The i r ,'v th arm may: have their lower ends moved intoland out of; a em n wi h eppeeed s de eeee pf, h ade. L A rep in leme eted bet een the; arm el'eW he h f ge their lo -ends apart; V i i Betweeethe al ii ii' l eet d. e e m' lelbeli l Y leiivl h ts, l es-e 3; beut the emit-181 f win i ov ment b t eeni he e'rme T is block 1e ape ed i er ee tienf s sh n in ignd hen tspper per e eizoreeid ere rdly: bet een he ermebbis eus sfll he m to: be sw ng b eethe Pi e 12 and th ir ewee-eede m ve toward e'ee o her un il the screws 18-oontaot w-ith-side face s of the. saw blade. 7

, y e i l ing. the er v Proper eei i a I h reef zwil he ewb ed m y b obta n d-1 Bede .16: end eerriedbrthie s d he f rw rd meving the uppe pertioiie o he e mell a d eem bl k; a d therlewer.

P -QI -Q the m ble k -eerrie japin 18 w i h p' i ts ppbsite s e thereof ndiie n nd d, o egege hene r fe es of the arms nd Swing the; arms up e id y the inope ve p s t on. ndiea ed y dotted; i ee; n; g' 'LE $pr 1 g p essed latchessolii" y e d yr tain he th ventical 'po'-:

sition byengagingrear faces/of; their upper:

per ie s.--:

In order to actuate the cam block and swing the arms vertically, there has been provided a shaft 20 which is rotatably engaged through openings in the upper portions of the side bars 4: and carries a depending handle 21 at one end. An arm 22 which is fixed to the shaft 20 projects forwardly therefrom and is pivoted to the upper end of a pitman 23 which has its lower end pivotally connected to straps 24 secured against side faces of the lower'end of the cam block 15. By moving the handle 21 forwardly, the shaft 20 is rotated to swing the arm 22 upwardly and this exerts pull upon the pitman or link 23 to swing the cam block about the shaft 8. As the cam block swings about the shaft 8 its upper end moves rearwa-rdly from between the arms 11 thereby allowing the spring 14 to move the lower ends of the arms apart and move the screws away from the saw blade.

t the same time, the lower end of the block 14 swings upwardly and the end portions of the rod or pin 18 by engaging rear faces of the arms cause the arms to be swung upward- 1y to the raised position indicated by dotted lines in Fig. 1 where they will be out of the way and not be struck by a log of such size that it could not pass the arms when in the position shown by full lines in this figure. When the handle is moved in an opposite direction the cam block and arms return to the vertical position and continued pressure upon the handle causes the upper portion of the cam block to move forwardly between the arms and swing the arms about the pins 12 to. move the screws 18 into engagement with the saw blade.

The latches 19 retain the arms in the vertical position but since they are springpressed the arms may be forced past them in case the lower ends of the arms should be struck by a log being cut. Therefore, danger of damaging the guide is eliminated. Since the abutment screws which bear against opposite side faces of the saw blade to prevent vibration are moved away from the blade before the arms are swung upwardly towards the horizontal inoperative position there is no danger of them catching against teeth of the saw and damaging the teeth.

What we claim is 1. A guide for a circular saw blade comprising-a frame having a cross head and depending side bars, a'shaft rotatably carried by said bars, arms carried by said shaft for swinging movement when the shaftrotates from a raised substantially horizontal inoperative position to a vertical operative position in which their lower end portions overlap a saw blade at opposite sides thereof, the arms being pivoted to the shaft for swinging movement longitudinally thereof whereby they. may have their lower ends moved into and out of contact with side faces of the blade, and

means to swing said arms into and out of the operative position and move their lower ends into contact with the blade after being moved to their operative position.

2. A guide for a circular saw blade comprising a frame having a cross head and depending side bars, a shaft rotatably carried by said bars, arms carried by said shaft for swinging movement when the shaft rotates from a raised substantially horizontal inoperative position to a vertical operative position in which their lower end portions overlap a saw blade at opposite sides thereof, the

arms'being pivoted to the shaft for swinging movement longitudinally thereof whereby they may have their lower ends moved into and. out of contact with the side faces of the blade, resilient means to yieldably hold the arms out of position to contact with side faces of the blade, and means to swing said arms into and out of the operative position and move their lower ends into contact with the blade after being moved to their operative position. i

prising a frame having a cross head and depending side bars, a shaft rotatably carried by said bars, arms carried by said shaft for swinging movement when the shaft rotates from a raised substantially horizontal inoperative position to avertical operative position in which their lower end portions overlap a saw blade at opposite sides thereof, the arms being pivoted to the shaft for swinging movement longitudinally thereof whereby they mayhave theirlower ends moved into and out of contact with the side faces of the blade, resilient means toyieldably hold the arms out of position to contact with side faces of the blade, a block loose upon said shaft between said arms having its upper portion constituting a cam to engage between upper portions of the arms and move the arms to dispose their lower ends in engagement with the side faces of the saw blade, and means to swing said block about the shaft, and move the arms into and out of an operative position. I

4. A guide fora circular saw blade comprising a frame having a cross head and depending side bars, a shaft rotatably carried by said bars, arms carried by said shaft for swinging movement when the shaft rotates from a raised substantially horizontal inoperative position to a vertical operative position in which their lower end portions overlap a saw blade at opposite sides thereof, the armsbeing pivoted to the shaft for swinging movement longitudinally thereof whereby they may have their lower ends moved into and out of contact with the sidefaces of the blade, resilient means to yieldably hold the arms out of position to contact with the side faces of the blade, a blockloose upon said shaft between said arms having its upper portion constituting a cam to engage between 0. A guide for a circular saw blade com- 35 thereof to engage the arms and swing-the,

, v 40 shaft, an arm projecting from said shaft,'a

the upper portions of the arms and move the arms to dispose their lower ends in engagement with the side faces of the saw blade, a pin carried by the lower portion of said 5 block and projecting from opposite sides thereof to engage the arms and swing the arms to the inoperative position when the lower portion of the block is swung upward- 1y, means for imparting swinging movement to the upper portion of the blockinwardly I between the upper portions of said arms.

'5. A guide for a circular saw blade comprising a frame having a cross head and de pending side bars, a shaft rotatably carried by said bars, arms carried by said shaft for swinging movement when the shaft rotates from a raised substantially horizontal 'inoperative position to a vertical operative position in which their lower end portions overlap a saw blade at opposite sides thereof, the

arms being pivoted to the shaft for swinging movement longitudinally thereof whereby I they may have their lower .ends moved into and out of contact with theside faces of the blade, resilient means to yieldably hold the arms out of position to contact with the side faces of the blade, a block looseupon said shaft between the said arms having its upper portion constituting a cam to engage between the upper portions of the arms and move the.

arms to dispose their. lower ends in engagement with the side faces of the saw blade, a 7 pin carried by the lower portion of said block and projecting from opposite sides 7 arms to the inoperative position when the lower portion of the block is swung upwardly, a rocker shaft rotatably supported by said frame above said arms, a handle for said link pivoted to said arms and having its lower end connected with the lower portion of said block to impart movement to the block when the rock shaft is rotated, and a rod carried by the side barsof said frame to engage the block and limit the movement of the upper portion of the block inwardly i between the upper portions of said arms. 7 v

In testimony whereof we aflix our signa V tures.

MARCUS L. MATHEWS. FRANK G. BRICE. 

